Sampling methods
Edexcel GCSE Maths revision on Sampling methods. Aligned to the Pearson Edexcel GCSE Mathematics 1MA1 specification. This bank has 16 practice questions on this topic.
Sample questions (3 of 16)
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Question 1
Which sampling method involves selecting every nth person from a list to ensure an even spread?
- A) Systematic sampling because it uses a regular interval.
- B) Stratified sampling since it sorts by a specific trait.
- C) Convenience sampling as it is easy to reach the group.
- D) Randomised sampling since it picks names from a bowl.
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Answer: Systematic sampling because it uses a regular interval.
The correct answer is systematic sampling because it uses a regular interval. Stratified sampling involves dividing a population into groups before selecting, whereas systematic sampling relies on a fixed periodic rule.
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Question 2
How many students should be selected from a group of 200 if the target sample size for a stratified survey is 10 percent of the total population?
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Answer: 20
To find the sample size, multiply the total population by the required percentage. 200 multiplied by 0.10 equals 20 students.
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Question 3
Which statement best describes a primary disadvantage of using convenience sampling for a school survey?
- A) Results are biased as they reflect only nearby users.
- B) Data is skewed since it ignores the wider population.
- C) Costs are higher because travel time is accumulated.
- D) Errors occur since the sample size is always too tiny.
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Answer: Results are biased as they reflect only nearby users.
Convenience sampling is biased because it only captures the views of people who are easily accessible, rather than a representative cross-section of the entire population. This often leads to skewed data that does not reflect the wider group.
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13 more questions on Sampling methods — plus mistakes tracking and spaced repetition across the whole Maths spec.